Poor treatment of characters and plots established in the comics.
Poor treatment of characters and plots established in the film series.

Overall it's just a weak film, half-baked and rushed.

This.

Also, the directing wasn't suited to the franchise. It sticks out like a sore thumb. The music was all over the place too. Mediocre cinematography. Plot holes.

Yeah that's all I've got. I remember I was so mad with the script that I completely re-wrote the entire film the way I think fell in line with the first two films and the comics.

EDIT:
Also there was a lot of really stupid elements, like "plastic guns". I can let that go, but still...

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This is why I say it's the ballot or the bullet.
It's liberty or it's death.
It's freedom for everybody or freedom for nobody.
America today finds herself in a unique situation... to become involved in a bloodless revolution